Flex 加载进度条

< ?xml version ="1.0" encoding ="utf-8"? >
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
????????layout="vertical"
????????verticalAlign="middle"
????????backgroundColor="white">
??
?? < mx:Script >
????<![CDATA[
??????private var timer:Timer;
??????
??????private function init():void {
????????timer = new Timer(10);
????????timer.addEventListener(TimerEvent.TIMER,timer_timer);
??????}
??????
??????private function timer_timer(evt:TimerEvent):void {
????????progressBar.setProgress(progressBar.value + 1,100);
??????}
??????
??????private function progressBar_complete(evt:Event):void {
????????timer.stop();
??????}
??????
??????private function resetProgressBar():void {
????????progressBar.setProgress(0,100);
????????progressBar.scaleX = 1.0; // 100%
????????progressBar.scaleY = 1.0; // 100%
????????progressBar.alpha = 1.0; // 100%
??????}
??????
??????private function playProgressBar():void {
????????resetProgressBar();
????????timer.start();
??????}
????]]>
?? </mx:Script>
??
?? < mx:Parallel id ="progressBar_completeEffect" >
???? < mx:Fade alphaTo ="0.0" />
???? < mx:Zoom zoomHeightTo ="0" />
?? </mx:Parallel>
??
?? < mx:ApplicationControlBar dock ="true" >
????
????<mx:Button label="Play"
???????????? click="playProgressBar();" />
????
????<mx:Button label="Reset"
???????????? click="resetProgressBar();" />
????
?? </mx:ApplicationControlBar>
??<mx:ProgressBar id="progressBar"
??????????complete="progressBar_complete(event);"
??????????completeEffect="{progressBar_completeEffect}"
??????????mode="manual"
??????????labelPlacement="center"
??????????width="80%"
??????????height="60%"
??????????creationComplete="init();" />
??
</mx:Application>